My thought-process at this point was to have different values for $name and $password but with the same sha1 signature. What immediately comes to mind is the SHA1 Collision attack recently revealed by the google team.

According to the google team, “It is now practically possible to craft two colliding PDF files and obtain a SHA-1 digital signature on the first PDF file which can also be abused as a valid signature on the second PDF file.”

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